Honda EM4500CXS Manuel De L'utilisateur page 43

4. SPARK PLUG SERVICE
Recommended spark plugs:
To ensure proper engine operation, the spark plug must be properly gapped
and free of deposits.
CAUTION:
If the engine has been running, the muffler will be very hot. Be careful not
to touch the muffler.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench to remove the spark plug.
SPARK PLUG CAP
40
BPR5ES (NGK)
W16EPR-U (DENSO)
SPARK PLUG WRENCH